North American deermouse records in Michigan lean heavily toward the Upper Peninsula and Lake Michigan shoreline, led by Ottawa National Forest with 17 named sightings, Keweenaw National Historical Park with 5, and Isle Royale National Park with 4. Few North American mammals range as widely as this one, and Michigan’s record reflects that: it turns up from mainland boreal forest to isolated Isle Royale in the middle of Lake Superior.
The record spikes hard in summer, jumping from double digits in June to 875 in August before dropping back by October, a swing that tracks trapping-survey timing and peak summer activity far more than a real late-summer population boom. NatureServe ranks the species S4, Apparently Secure, statewide.
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